Low-vanadium nitrogenous hot work die steel and manufacturing method thereof

Abstract

The invention discloses low-vanadium nitrogenous hot work die steel and a manufacturing method of the low-vanadium nitrogenous hot work die steel. The low-vanadium nitrogenous hot work die steel comprises, by mass percentage, 0.3%-0.4% of C, 0.2%-0.6% of Si, 0.2%-0.5% of Mn, 4.5%-5.5% of Cr, 1.1%-1.7% of Mo, 0.4%-0.6% of V, 0.02%-0.07% of N, 0.005%-0.03% of Ce, 0.001%-0.006% of Mg and the balance Fe. The method comprises the following steps of (1) smelting molten steel according to the set components, and carrying out nitrogen increasing by adopting a gas-phase nitriding method, and conducting pouring operation; (2) conducting homogenizing operation at the temperature ranging from 1200 DEG C to 1250 DEG C; (3) conducting forging operation; (4) conducting normalizing operation at the temperature ranging from 1000 DEG C to 1100 DEG C; (5) conducting spheroidizing annealing operation; (6) conducting heat preservation at the temperature ranging from 1000 DEG C to 1050 DEG C, conducting oil cooling and accomplishing quenching; and (7) carrying out heat preservation at the temperature ranging from 530 DEG C to 620 DEG C for 2-6 hours twice, and conducting tempering. According to the components of the low-vanadium nitrogenous hot work die steel, the content of vanadium and the content of silicon are reduced, the proper amount of nitrogen is added, the trace amount of rare earth and the trace amount of magnesium are cooperatively added, the cleanliness of the steel is improved, the carbide distribution effect is improved, and finally the performance of the die steel is improved.

Description

technical field

[0001] The invention belongs to the technical field of materials and metallurgy, and in particular relates to a low-vanadium nitrogen-containing hot work die steel and a preparation method thereof. Background technique

[0002] The level of the mold industry has become one of the important symbols to measure the level of the country's manufacturing industry; hot work die steel is one of the fastest-consuming and most demanding die steels, mainly used to manufacture solid metal or high-temperature liquid metal pressing molds, Widely used in hammer forging dies, hot extrusion dies and die-casting dies.

[0003] In order to improve the overall performance of hot work die steel and prolong the service life of the die, the common alloying idea is to increase the content of noble alloy elements such as molybdenum and vanadium to improve the performance of hot work die steel such as friction and wear resistance, cold and heat fatigue resistance, etc. However, the a...

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